Been exchanging a few words with support. Next step is bug report.
Rolled a tank and have been extremely active in the Random LFG finder. I have an Addon that tells me all sorts of info on players in chat. If they are friends, if they are guild mates and... if you have them on ignore.
Twice this last week i have joined randoms with ignored players. When in the same group, you can see their chat, and they can see yours. You can communicate with each other.
Many of the players i have ignored are abusive and show ill mannerisms. Without your ignore function operating properly I feel unsafe and have again been put under stress in both of these encounters.
To verify my addon has not been in error, i had checked both times in my ignore roster and have found them listed. Checking further, they were not in any guilds i was in either.
Id prefer it if they were not able to join a random with you at all. But breaking that safety communication barrier is unacceptable and must be fixed as soon as possible.